<template>
  <div>
    <div class="header-wrapper">
      <div class="header-wrapper">
        <yd-navbar title="商品列表" height='40px' fontsize='16px'>
        </yd-navbar>
      </div>
    </div>
    <div class="goods">
      <div class="menu-wrapper" ref="menuWrapper">
        <ul>
          <li v-for="(item,index) in goods" class="menu-item" :class="{'current':currentIndex===index}" @click="selectMenu(index,$event)" ref="menuList" :key="index">
            <span class="text border-1px">
                                              <!-- <span v-show="item.type>0"></span> --> {{item.typename}}
            </span>
          </li>
        </ul>
      </div>
      <div class="foods-wrapper" ref="foodsWrapper">
        <ul>
          <li v-for="(item,index) in goods" class="food-list" ref="foodList" :key="index">
            <h1 class="title">{{item.typename}}
            </h1>
            <ul>
              <li @click="selectFood(food,$event)" v-for="(food,index) in item.products" class="food-item border-1px" :key="index">
                <div class="icon">
                  <img width="57" height="57" :src="apis+food.imageurl" alt="主材图片">
                </div>
                <div class="content">
                  <h2 class="name">{{food.productname}}</h2>
                  <!-- <p class="desc">{{food.description}}</p> -->
                  <!-- <div class="extra">
                                                      <span class="count">月售{{food.sellCount}}份</span><span>好评率{{food.rating}}%</span>
                                                    </div> -->
                  <div class="price">
                    <span class="now">￥{{food.price}}</span>
                    <!-- <span class="old" v-show="food.oldPrice">￥{{food.oldPrice}}</span> -->
                  </div>
                  <div class="cartcontrol-wrapper">
                    <cartcontrol @add="addFood" :food="food"></cartcontrol>
                  </div>
                </div>
              </li>
            </ul>
          </li>
        </ul>
      </div>
      <shopcart ref="shopcart" :selectFoods="selectFoods"></shopcart>
    </div>
  </div>
</template>

<script type="text/ecmascript-6">
  import BScroll from 'better-scroll'
  import shopcart from '@/components/shopcart/shopcart'
  import cartcontrol from '@/components/cartcontrol/cartcontrol'
  import apis from '../../../static/js/api.js'
  import getUrl from "../../../static/js/getUrl.js";
  export default {
    components: {
      shopcart,
      cartcontrol
    },
    data() {
      return {
        goods: [],
        listHeight: [],
        scrollY: 0,
        selectedFood: {},
        userInfo: {},
        apis,
        wxuserinfoid: ''
      }
    },
    computed: {
      currentIndex() {
        for (let i = 0; i < this.listHeight.length; i++) {
          let height1 = this.listHeight[i]
          let height2 = this.listHeight[i + 1]
          if (!height2 || (this.scrollY >= height1 && this.scrollY < height2)) {
            this._followScroll(i)
            return i
          }
        }
        return 0
      },
      selectFoods() {
        let foods = []
        this.goods.forEach((good) => {
          good.products.forEach((food) => {
            if (food.count) {
              foods.push(food)
            }
          })
        })
        return foods
      }
    },
    created() {
      // 从地址链接上取微信用户id
      this.wxuserinfoid = getUrl().wxuserinfoid;
      if (this.wxuserinfoid) {
        // 可以进行后续的操作
        this.usermsg()
      } else {
        // 否则的话没有用户id,提示用户信息不存在，请重试或联系管理员
        this.$vux.alert.show({
          title: '错误提示',
          content: '用户信息不存在，请重试或联系管理员',
        })
      }
    },
    methods: {
      getInfo() {
        this.$vux.loading.show({
          text: "正在加载"
        });
        this.$axios
          .post(
            `${apis}/app/order/getlist`,
            this.confusion(
              JSON.stringify({})
            ), {
              headers: {
                Authorization: 'Bearer ' + JSON.parse(window.localStorage.getItem('userInfo')).token,
                'Content-Type': 'application/json;charset=UTF-8',
                'Cache-Control': 'no-cache',
                isApp: 'isApp'
              }
            }
          )
          .then(response => {
            this.$vux.loading.hide();
            this.goods = response.data
            this.$nextTick(() => {
              this._initScroll()
              this._calculateHeight()
            })
          })
          .catch(error => {
            this.$vux.loading.hide();
            console.log(error)
            this.$dialog.toast({
              mes: '服务器异常'
            })
          })
      },
      usermsg() {
        this.$vux.loading.show({
          text: "正在加载"
        });
        var qs = require('querystring')
        this.$axios.post(`${apis}/auth/messagep`,
            qs.stringify({
              vid: this.wxuserinfoid
            }))
          .then(response => {
            if (response.data) {
              this.$vux.loading.hide();
              this.userInfo = response.data
              window.localStorage.setItem('userInfo', JSON.stringify(this.userInfo))
              this.getInfo()
            }
          })
          .catch(error => {
            console.log(error)
            this.$vux.loading.hide();
            this.$dialog.toast({
              mes: '服务器异常'
            })
          })
      },
      selectMenu(index, event) {
        // if (!event._constructed) {
        //   return
        // }
        let foodList = this.$refs.foodList
        let el = foodList[index]
        this.foodsScroll.scrollToElement(el, 300)
      },
      selectFood(food, event) {
        if (!event._constructed) {
          return
        }
        this.selectedFood = food
        // this.$refs.food.show()
      },
      addFood(target) {
        this._drop(target)
      },
      _drop(target) {
        // 体验优化,异步执行下落动画
        this.$nextTick(() => {
          this.$refs.shopcart.drop(target)
        })
      },
      _initScroll() {
        this.meunScroll = new BScroll(this.$refs.menuWrapper, {
          click: true
        })
        this.foodsScroll = new BScroll(this.$refs.foodsWrapper, {
          click: true,
          probeType: 3
        })
        this.foodsScroll.on('scroll', (pos) => {
          // 判断滑动方向，避免下拉时分类高亮错误（如第一分类商品数量为1时，下拉使得第二分类高亮）
          if (pos.y <= 0) {
            this.scrollY = Math.abs(Math.round(pos.y))
          }
        })
      },
      _calculateHeight() {
        let foodList = this.$refs.foodList
        let height = 0
        this.listHeight.push(height)
        for (let i = 0; i < foodList.length; i++) {
          let item = foodList[i]
          height += item.clientHeight
          this.listHeight.push(height)
        }
      },
      _followScroll(index) {
        let menuList = this.$refs.menuList
        let el = menuList[index]
        this.meunScroll.scrollToElement(el, 300, 0, -100)
      }
    }
  }
</script>

<style lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixin.styl"

  .goods
    display: flex
    position: absolute
    top: 40px
    bottom: 46px
    width: 100%
    overflow: hidden
    .menu-wrapper
      flex: 0 0 80px
      width: 80px
      background: #f3f5f7
      .menu-item
        display: table
        height: 54px
        width: 80px
        padding: 0 12px
        line-height: 14px
        &.current
          position: relative
          z-index: 10
          margin-top: -1px
          background: #fff
          font-weight: 700
          color red
          .text
            border-none()
        .icon
          display: inline-block
          vertical-align: top
          width: 12px
          height: 12px
          margin-right: 2px
          background-size: 12px 12px
          background-repeat: no-repeat
        .text
          display: table-cell
          width: 56px
          vertical-align: middle
          border-1px(rgba(7, 17, 27, 0.1))
          font-size: 12px
    .foods-wrapper
      flex: 1
      .title
        padding-left: 14px
        height: 26px
        line-height: 26px
        border-left: 2px solid #d9dde1
        font-size: 12px
        color: rgb(147, 153, 159)
        background: #f3f5f7
      .food-item
        display: flex
        padding 8px
        padding-bottom: 18px
        background-color #fff
        border-1px(rgba(7, 17, 27, 0.1))
        &:last-child
          border-none()
          margin-bottom: 0
        .icon
          flex: 0 0 57px
          margin-right: 10px
        .content
          flex: 1
          .name
            margin: 2px 0 8px 0
            height: 14px
            line-height: 14px
            font-size: 14px
            color: rgb(7, 17, 27)
          .desc, .extra
            line-height: 10px
            font-size: 10px
            color: rgb(147, 153, 159)
          .desc
            line-height: 12px
            margin-bottom: 8px
          .extra
            .count
              margin-right: 12px
          .price
            font-weight: 700
            line-height: 24px
            .now
              margin-right: 8px
              font-size: 14px
              color: rgb(240, 20, 20)
            .old
              text-decoration: line-through
              font-size: 10px
              color: rgb(147, 153, 159)
          .cartcontrol-wrapper
            position: absolute
            right: 0
            bottom: 12px
</style>
